G3 ION Binding Template and Screw Layout

Post by WildSnow.com blogger | November 2, 2015      

Shop for G3 ION

UPDATE November 2, 2015, Latest ION 2015-2016 hole pattern is virtually the same as before, slight difference is the 2015-2016 version we have here measures 40 mm wide at the toe, while older versions measure 39.5. This difference would result in drilled holes only being off by .25 mm, which is within tolerance for ski mounting. Even so, we checked our template for accuracy, it is fine and dimensions are clarified in blog post below.

G3 ION tech ski binding, copy of the standard tech binding with enough added features to set it apart.

G3 ION tech ski binding, based on the standard tech binding but with many small changes and definitely a different screw mounting pattern.

Word from G3 is they designed ION screw pattern (and mounting position on ski) to have the least overlap possible with existing tech binding mount patterns. Moreover, the layout is wider than most tech binding screw patterns.

2015-2016 ION pattern is 40mm wide x 45 long (mm) mm at toe, and 36.5 wide x 52.5 long at the heel. Earlier models may be 39.5 mm wide at the toe, this template is intended to match the latest bindings, easy to check by setting your binding on the template and seeing how the holes line up with marks on template. Be aware, however, that manufacturing tolerances combined with slight variations in how the template is printed (paper even expands and contracts with humidity and heat) can result in slight variation. Don’t obsess, if for example a pair of holes is .5 mm off, that’s only .25 mm per hole, easily within the variations caused by hand drilling.

Our ION  ski touring binding mount mount template.

Our ION ski touring binding mount mount template. Grab it here.

Major brand popular tech binding model is 30 mm wide x 40 long at toe, and 32 mm wide x 53 long at the heel. That may sound like it’s still close, but ION appears to place the screw holes in significantly different positions in the forward/back direction once the boot is matched to its correct position on the ski — thus preventing overlap if you want to change binding models/brands or buy used skis with the ubiquitous tech binding screw holes. (I’d make a graphic comparing the two screw patterns, but it would be misleading since they end up quite differently in terms of fore/aft, depending on boot size as well as optional adjustments in fore/aft binding position.)

For those of you concerned about how wide your binding mount pattern is, note that ION is significantly 10 mm wider at the toe, and insignificantly wider at the heel.

MOUNTING TIPS for do-it-yourself: The ION heel unit is unforgiving of mistakes in screw hole positions, and is likewise unforgiving of screw hole “volcano-ing” wherein the top of the screw hole bulges up as you insert the screw. After drilling holes, we’d recommend a slight countersink of the screw hole in the ski to compensate for volcanoing. The G3 OEM stainless steel screws are weak, in skis with metal top sheet or metal binding reinforcement plate you use a 9.5 mm long ski drilling bit, at 4.1 mm diameter. Otherwise while inserting or removing the stainless steel screws you can damage or even break them. G3 recommends using the 4.1 diameter drill bit for all mounts. In our experience you can cheat to a 3.5 mm bit in skis that don’t have metal, but we agree that using a 4.1 for all mounts is fine. Waterproof white wood glue is fine for sealing the holes, though we recommend epoxy that can be reversed by heating. Five minute epoxy is said to be brittle, with one-hour versions being better, best being “flexible” epoxy such as Hardman Orange.

If you want to play around with ION mount pattern (or mount IONs once they’re available), here is the link to our WildSnow ION paper mounting template.

Our original ION first look.

On snow review.

Shop for G3 ION


Please Enjoy A Few Suggested WildSnow Posts


40 Responses to “G3 ION Binding Template and Screw Layout”

  1. CDR February 11th, 2014 1:46 pm

    Is their a G3 ION for snowboarding bindings? I think these would come in handy for snowboarders.

  2. me February 12th, 2014 4:00 am

    Can You please indicate where the pins would go in that template? Preferably, both toe pins and heel pins (on both adjustment extremums). This way we will know how the boot will fit into equation. In current state, w/o knowing where the boot will land, (and keeping in mind that You provided us with measurements between holes) this template usefulness approaches zero 🙁

  3. Billy jack February 12th, 2014 7:15 am

    Everything about that looks like it will break

  4. kevin February 12th, 2014 10:08 am

    Looks pretty sweet to me. I am pretty excited to see more competition for dynafit. The market has suddenly become competitive, and innovation is the result. The anodized aluminum is gorgeous. I was reading a boot review here and was amazed at all the negativity that is cropping up here on wildsnow. Lots of armchair quarterbacks telling how a product could be better and then the group complaining about a race boot not being stiff enough for their freeriding. I guess Lou has to take some of that blame since he is always picking apart the gear. I definitely don’t need to hear comments disparaging a product because it doesn’t meet their needs, when they are not the target audience. The innovation right now in alpine touring is staggering and I applaud the manufacturers for the incredible design work that is being done. I am hopeful the backcountry innovation will drive alpine gear to up their game as well.

  5. Lou Dawson February 12th, 2014 10:38 am

    Me, there is no standard measurement between toe and heel (though I’d imagine the G3 mechanical mounting jig will work to some arbitrary standard that probably will place the heel’s boot length adjust midway in the range), you simply mount it using the boot as a gauge for position of binding on ski. Child’s play.

    The template is far from useless, anyone familiar with mounting tech bindings could use it and mount an ION binding in their sleep.

    But yes, pin position at least o the toe would be useful for comparative purposes so I’ll add it. It’s tough to figure out exactly by just looking at the binding, but appears that the pin line (left/right line) for the toe is centered fore/aft between the two screw pairs. I’ll check with G3 and add a line to the template.

    BTW, in case you missed the memo (grin), the technique for DIY mounting using this sorts of templates is to snap your boot into the toe unit, set toe unit on ski with boot lined up with ski mounting mark, mark hole positions, then match template to the hole positions to set for/aft position. Same with heel. Adjust to midrange, set boot heel down on ski, mark binding position, then match that with template. It’s super easy, don’t over think it.


  6. Lou Dawson February 12th, 2014 10:43 am

    Kevin, I’ll take whatever blame is appropriate. My take and publishing endeavors are most certainly not perfect! And I do agree. I’ll admit I’m fed up at times with people trying to force ski products to do what they’re not designed for. It’s like driving a European motorway at 120 MPH with tires that are rated for 90 MPH, then complaining when you get a blowout and end up doing sheet time. ON THE OTHER HAND, a bit of forcing products outside their envelop is indeed what drives innovation. It’s just that it needs to be done realistically and with a positive attitude, not just a source for whining. Lou

  7. Jailhouse Hopkins February 12th, 2014 4:09 pm

    “Least amount of overlap”, correct me if I’m wrong but swapping out Comforts, Verticals and Plum Guides is impossible, no?

  8. Lou Dawson February 12th, 2014 5:07 pm

    Using same holes? To one degree or another, yes, but not perfectly.

    Most modern skis can have a few extra holes with no detriment, so long as they don’t overlap. And even if a few overlap it can still be made to work in most cases.


  9. Jailhouse Hopkins February 12th, 2014 7:06 pm

    I should clarify. Can the Ion be securely attached to skis already drilled with the Guide, Vertical pattern? I would think no, but I’ll defer to those with more experience.

  10. lou dawson February 12th, 2014 8:29 pm

    Actually, probably yes.

  11. Jailhouse Hopkins February 13th, 2014 8:25 am

    Probably ain’t exactly reassuring, especially when its a pair of dps skis!

  12. Lou Dawson February 13th, 2014 8:44 am

    Jail, if you download both templates, you should be able to figure out the relationship, just figure boot position with ION is boot toe tech fittings are midway between the front pairs of holes. I’m checking on that to be sure, but close enough for estimating a comparo. I have an ION binding here, but it’s difficult to exactly measure the toe pins position as compared to the screw positions.

    I can tell you for sure that the toe holes will not overlap though the front pair will be close. Heel is what you want to compare.


  13. Jailhouse Hopkins February 13th, 2014 1:12 pm

    After downloading the Guide’s template from Binding Freedom, the toe holes will be okay, but overlap on all four heel holes are present.

  14. Lou Dawson February 13th, 2014 2:09 pm

    Jail, the heel holes are optional in that you can adjust the binding heel a bit forward or back so when you’re boot is in, the binding heel falls on the ski in such a way as to prevent overlap. Another thing to remember is that the ION has no tech gap at the heel. My guess is that the default heel screw holes for Plum vs ION has no overlap due to the above factors. I’ll try to add more to template to make this clear. Waiting on some information. Lou

  15. Jailhouse Hopkins February 13th, 2014 2:24 pm

    Hence the deferral! Much appreciated.

  16. Lou Dawson February 13th, 2014 6:02 pm

    Looks like ION toe pin left/right line is approx 5 mm back from midpoint between screw pairs. Am updating template.

  17. me February 14th, 2014 9:48 am

    Lou, thanx. Now at least we’re able to calculate the distance between old and (theoretically) new holes.

  18. Lou Dawson February 14th, 2014 11:10 am

    No problem Me, I understand the need for knowing where the binding toe pins locate fore/aft. As for the heel unit, let me repeat that they have enough fore/aft adjustment to almost always be able to locate so you’d get no screw hole overlap.

  19. Jailhouse Hopkins March 19th, 2014 8:57 am

    Template updated?

  20. Lou Dawson March 19th, 2014 10:07 am

    Updated in what way? I did add the Pin Line… Let me know. Thanks, Lou

  21. Jailhouse Hopkins March 19th, 2014 4:17 pm

    Ashamedly, I do not know the relevance of the toe pin line. Explain please!

  22. Lou Dawson March 19th, 2014 6:53 pm

    It’s so you can quickly figure out if screw holes will overlap with an existing binding mount, or even doing a really fast mounting job. Best however is to clamp the binding to the boot toe, set the assembly on ski, line up boot with mark on ski, mark one or two screw hole positions, then line up the paper template with the marked screw hole positions. Lou

  23. randy December 2nd, 2014 11:24 am

    thanks for all the awesome tech advice. Aactually very helpful to us home shop guys. I am always amazed at how you deal with the testy folks. Id probably lose it.

  24. Rich Meyer December 5th, 2014 11:58 am

    Hello WildSnow Team,
    I’m trying to mount the Fritischi Scout and noticed the hole pattern is different than the Freeride. You have a link to a paper template? or? Thanks!

  25. Lou Dawson 2 December 6th, 2014 6:24 pm

    Hello Rich, I don’t recall having a paper template for the Scout. Easy enough to make one. I used to use Microsoft Word Draw for templates, now I’m all over the map as I’ve sworn off Microsoft as much as possible. Just measure the hole separation, make a drawing on the computer with a center line, and print out. For quickie mounts you can even just lay the binding on the ski and mark the holes. Lou

  26. Rich Meyer December 6th, 2014 6:34 pm

    Lou, Thanks appreciate the reply! I’ve done a bunch of “free form” mounting in the past and was trying to avoid that. But, great info nonetheless. And (naturally) a paper template showed up in the mailbox today! So I should be good to go. Happy winter!

  27. Thom Mackris December 19th, 2014 1:21 am

    Hi all,

    Firstly, a big THANK YOU to Lou for drawing the mounting template.

    I learned a few things today while fiddling with a new pair of Ions. Even if you have experience mounting Dynafits, it wouldn’t hurt to test mount these bindings on a 2×4. They’re certainly intuitive for the experienced Dynafiddler, but there are few new tricks you need to be aware of, especially if you’re trying to be cute and mount at one end of the mounting range as I was considering.

    I was checking to see if I could accommodate both a boot with a 302mm BSL, as well as a TLT style boot which (for me) has a BSL of 287mm. Additionally, there may be a Scarpa in my future and its BSL would be 305mm. That’s a whopping 18mm of range (287-305), and I decided that I’m playing with fire in trying to accommodate this, but let me explain my reasoning so if you choose to go down this rabbit hole, you’re better prepared.

    Using my trusty dial indicator, I measured approximately .885″ of total length adjustment (22.5mm) in the heel pieces. This was a conservative measurement. You can likely squeeze another mm or two. As you play with the binding, you’ll realize however, that if you locate the binding too far forward on the adjustment rail, you “permanently” engage the catch for the brake, and it won’t deploy. For this reason, I backed off perhaps an extra 1mm when measuring the adjustment range, to not push the forward adjustment point to its absolute minimum (thereby reducing potential wear on the catch). Perhaps Cam Shute can comment, but I think this is wise treatment of any equipment. The brake catch is a brilliant design, BTW.

    A couple of other notes:

    I measure the toe pin centers as being about 21mm in front of (toward the ski tip) from the rear set of screw holes on the toe piece. That’s about 2mm from Lou’s quick ‘n dirty measurement, but if you can tell the difference on your skis, you’re a better man than me ? In other words, Lou’s template is fine as far as I’m concerned (thanks again, Lou!).

    As far as locating a heel line on the template … well, it depends. This is where all of the games I was playing need to be taken into account again. The relationship between the boot heel and the screw holes will change if you’re trying to favor one end of the binding’s adjustment over the center.

    I’m going to opt for a conservative approach, by shooting to mount the binding so the heel ends up in the middle of its range. Don’t take the following number as gospel, but my initial measurments have the boot heel line about 15mm (.591) behind the front pair of holes on the heel piece. This is where it gets tricky, and a 2×4 test mount is your friend. The reason is, that you need to understand how the boot’s heel butts up against the heel piece, and exactly where it contacts the heel piece. You can easily be off by a mm or two due the challenge of eyeballing the slope of the boot’s heel and its contact point with the heel unit.

    A small square (or an experienced set of eyeballs) can help, but I noticed that I ended up moving the heel piece about 1.5mm from where I thought it would end up, so the 15mm number is nominal and not absolute. Given my 1.5mm error in boot heel marking, it’s yet another reason I opted for the conservative “302” mount. Additionally, it appears as if the forward pressure spring compresses and stretches as you adjust the binding for boot length. No doubt, it works to spec over this range, but I’ve always liked the the idea of operating devices in the middle of their range for more linear behavior.

    I’ve been abnormally (even for me) OCD about this, but this was a useful analysis, and I hope this helps answer questions you hadn’t thought about asking. The binding looks like a very solid design, and I’ll report back if I learn anything else after I do the mount.


  28. Thom Mackris December 19th, 2014 1:54 am

    I just noticed that Terry from Slidewright has some photos over at TGR, showing how the Jigarex measures the heel line. This might be helpful.

    I was essentially doing the same thing with a square, but still ended up being 1.5 mm off. Maybe I was tired.


    I’m not sure what he’s trying to accomplish with the template on page 6 of this thread. My eyes are too blurry from all of this measuring tonight 🙂


  29. Lou Dawson 2 December 19th, 2014 7:19 am

    Shew! Even Cam might burn out on this! (just kidding Cam)

    I’ve got about 15 days on the ION now. No real issues. Once in a while the brake pops up off the catch, usually when the skis are being fiddled with (in transport, or while applying skins). I’ve learned to watch out for hands getting pinched, and the heel lifters get flipped once in a while while breaking trail or doing kick turns. Best thing for me is I can pretty much tour without locking the toes, thus adding an element of safety and convenience. To be nice to G3 I’ll do a “real use review” but it’s rather funny to think that for a change I don’t have that much to blather about (grin), they seem to be a very mature product, you get the feeling G3, after some lessons learned, was going to get a binding out there that didn’t require writers to sort out issues, but rather just go out and use to get some vertical and have fun. The issue-free face shots have been very refreshing!

    P.S., ION is of course too heavy for me. For some time I’ve heard rumors of other bindings in the pipe from G3 more along the lines of a classic “touring” binding. That’ll be cool if it happens.

  30. Thom Mackris December 19th, 2014 6:51 pm

    Mounted with no surprises. I’m as impressed as you are, Lou – a very mature design. Yes, it’s a bit on the robust side for your tastes, but we all knew that 🙂

    One minor problem I had while working on the bench and removing the boot … I twisted the boot a bit (as you would when exiting the binding), and I popped the heel slider off. I was unable to repeat this (a good thing), but I’ll watch this, nevertheless.

    Now, to get some miles on these babies.


  31. Thom Mackris December 19th, 2014 6:53 pm

    Clarification – the “exit” I described above was to open the toe, lift at the toe and twist. I wasn’t testing a side release when the plate popped loose.

    … Thom

  32. Thom Mackris December 22nd, 2014 12:29 am

    Quick update …

    Since I transferred your template to my own CAD drawing (moi? OCD???), I’m going to adjust the reference point of the heel line from 15mm to 16.5mm – effectively mounting the heel piece forward by this amount.

    The only reason for this, is in case I have a CRC moment (can’t remember crap) when doing any future mounts … this, in case I try to get cute with a “stretch” mount to accommodate two boots of different lengths.


  33. JanIdar October 27th, 2016 1:37 am

    Is the screw pattern same in ION LT? Looking forward to upgrade(?) from Speed Radicals.

  34. Lou Dawson 2 October 27th, 2016 6:56 am

    Speed Radical and ION LT screw patterns are different, with care you could do a swap by drilling a new set of holes.

    Or are you asking how ION LT compares to ION 10-12 ?


  35. JanIdar November 4th, 2016 10:27 pm

    Hi Lou,

    Yes, I was asking how ION LT screw pattern compares to ION 10&12. Sorry to mislead by talking about Radicals.

    Different pair of (new) skis so no hole conflict, still keepind Dynafits on skinnier skis.

  36. Lou Dawson 2 November 5th, 2016 8:06 am

    ION LT, 10 and 12 all have same screw pattern, I recall ION demo binding has a longer pattern at the heel. Lou

  37. Joe November 24th, 2017 2:15 pm

    I have a pair of rossi Sin 7s that had 22 Designs vice bindings on them. Anyone know if the ION mounting pattern will overlap at all?

  38. James December 14th, 2018 4:19 pm

    The paper template looks a little bit off (1 mm) in the toe widths. I’m going to compensate by punching off from center by .2-.4mm. Would be nice if the template could be updated for 2018.

  39. James December 14th, 2018 5:01 pm

    Disregard my last comment. It’s close enough and when doing any mount I’ve found there is always a bit of fiddling, as you mentioned, from tolerances and other things.

  40. Tomaž December 30th, 2018 12:40 pm


    I hawe a problem with the g3 ION. During the skiing my toe part of bindings opened up seweral times and I hawe fall. Always in ski position, so I must lock up the toe binding to safely skee from the mountain.

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  • Welcome to Louis (Lou) Dawson's backcountry skiing information & opinion website. Lou's passion for the past 50 years has been alpinism, climbing, mountaineering and skiing -- along with all manner of outdoor recreation. He has authored numerous books and articles about ski touring and is well known as the first person to ski down all 54 of Colorado's 14,000-foot peaks, otherwise known as the Fourteeners! Books and free ski touring news and information here.

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